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Siemens
Desigo TRA Engineering, mounting and installation
CM111043en_09
Building Technologies
EnOcean RF networks
2016-02-22
Brightness refers to how the human eye perceives the intensity of a light source.
Brightness is measured in Lux [lx]. The human eye can perceive various light
sources with the same brightness. Depending on the technology, solar cells have
varying degrees of efficiency for daylight and artificial light. Fluorescent lights
require at least 30% greater brightness to generate the same level of charging as
daylight.
The value of the product light (Lux) and duration (h) are referred to as Lux h.
The amount of available daylight in the winter is minimal. Winter must be used for
calculations if the intent is to guarantee functionality. Of further note is that
illuminance differs on horizontal versus vertical surfaces. As a matter of principle,
horizontal surfaces are better then vertical, of course with the exception of roofs.
The following minimum conditions must be guaranteed for the mounting location of
STM solar cells:
Check the STM initialization parameters as described in the user's guide.
Check light sources (daylight or artificial light). Assume a worst case involving
fluorescent lamps if the light source cannot be clearly defined.
Define minimum brightness and duration of illuminance required to ensure
operation.
Check lighting conditions on the planned mounting location for the module
assuming the least favorable conditions (e.g. in winter).
The energy cell drains too much if the average illuminance drops below the
defined, indicated values and transmission ceases. Transmissions resumes
automatically as soon as the energy cell is sufficiently charged.
The list provides typical illuminance values. Please use a Lux meter to measure
actual values.
A satisfactory Luxmeter is available as of EUR 30.
Building type
Room type
Typical brightness
Apartments
Normally
100 - 500 lx
Schools
Hallway
100 - 300 lx.
Class rooms in general
300 - 750 lx.
Reading rooms, labs
500 - 1500 lx.
Offices
PC rooms, working on PCs
200 - 500 lx.
Meeting rooms
300 - 700 lx.
Cafeteria
150 - 300 lx.
Hallways
50 - 100 lx.
Reception area
300 - 700 lx.
Bathrooms
100 - 300 lx.
production
Manufacturing halls
500 - 1500 lx.
Development, office
300 - 750 lx.
Design CAD
500 - 1500 lx.
Labs and inspections
750 - 1500 lx.
Product packaging
150 - 500 lx.
Storage
100 - 300 lx.
Hospitals
Visitor rooms
300 - 500 lx.
First aide, surgery
500 - 1500 lx.
Patient rooms
100 - 300 lx.
Pharmacies
500 - 1000 lx.
Laundry rooms
150 - 300 lx.
Hotels
Reception area
200 - 500 lx.
Reception areas
100 - 300 lx.
Definition: Illuminance
Minimum room
conditions
Note
